This is exactly the reason why I hate sites that use one-time email sign-in links. The link opens in Webview, then you have to click a separate button to reopen

This is exactly the reason why I hate sites that use one-time email sign-in links. The link opens in Webview, then you have to click a separate button to reopen the page in Safari, but by that time the token is marked as used, so you can't login except in this temporary window that is going to immediately disappear the second you perform any other action.